as you can guess, this is an issue regarding swift's whole API renovation. I've read the documentation extensively but can't seem to lay my finger on a proper workaround.
I am receiving the error
Value of type 'Error' has no member 'userInfo'
on the following line:
else if let secondMessage = error?.userInfo["error"] as? String
of this block:
let query = PFQuery(className: "Images")
query.whereKey("Subject", equalTo: self.subjectName)
query.findObjectsInBackground { (objects, error) -> Void in
if error == nil {
// do something
}else if let secondMessage = error?.userInfo["error"] as? String {
// do something
}
Any suggestions? feel's like I'm missing something painstakingly obvious... dev block i guess :(
Related
I have a completion handler in a framework written in Objective C...
This is a typedef for a block type. It takes an array of PHErrors.
typedef void (^PHBridgeSendErrorArrayCompletionHandler)(NSArray *errors);
When I try to use this in Swift, I'm doing....
anObject.aMethod(completionHandler: { (errors: [ AnyObject?]) -> () in
...rest of code
}
But I keep getting this error:
Cannot convert value of type '([AnyObject?]) -> ()' to expected argument type 'PHBridgeSendErrorArrayCompletionHandler!'
Can anyone help, I'm baffled, it looks like it should work to me.
Or better yet, you can still use your typedef as typealias.
DEFINE
typealias PHBridgeSendErrorArrayCompletionHandler = (_ errors: [Error]?) -> Void
IMPLEMENTATION
func myFunctionWithErrorCompletion(completion: PHBridgeSendErrorArrayCompletionHandler) {
// Define empty array to add errors to
var errors:[Error]?
// Do Your Logic that may store errors to array
// Completion and pass errors
completion(errors)
}
USAGE
func anotherOfMyFunctions() {
// Call the function
myFunctionWithErrorCompletion { (errors) in
if let completionErrors = errors {
// React to errors
}
}
}
anObject.aMethod(completionHandler: { (errors: [ AnyObject?]) -> () in
}
should be
anObject.aMethod() { errors in
}
In order to dig any deeper, I have to know what PHBridgeSendErrorArrayCompletionHandler is
So my friend solved this problem by simply changing AnyObject to Any
(errors: [Any]?) in
Which baffles me because all objects in an NSArray are objects! So didn't think to try Any.
Im pretty new to Swift mind
Try this..
anObject.aMethod(completionHandler: { (errors:NSArray?) -> () in
...rest of code
}
It is giving me the Error: Cannot call value of non-function type 'HTTPURLResponse?'
It should be caused by #escaping but I cannot make it work in the sentence below. Please help, Swift 3.0, AlamofireImage.
There are other similar answers but cannot make them work with my code below.
func getNetworkImage(_ urlString: String, completion: #escaping ((UIImage) -> Void)) -> (ImageRequest) {
let queue = decoder.queue.underlyingQueue
let request = Alamofire.request(urlString)
let imageRequest = ImageRequest(request: request)
imageRequest.request.response(
queue: queue,
responseSerializer: Request.imageResponseSerializer(),
completionHandler: { response in
guard let image = response.result.value else {
return
}
let decodeOperation = self.decodeImage(image) { image in
completion(image)
self.cacheImage(image, urlString: urlString)
}
imageRequest.decodeOperation = decodeOperation
}
)
return imageRequest
}
The error message: Cannot call value of non-function type 'HTTPURLResponse?' is telling you that the instance variable value can not be accessed. The bad thing is that it is telling you this in the wrong line of code. That may be the reason why it was so difficult to find.
The structure of the response object has changed. You code:
guard let image = response.result.value else {
return
}
Won't work anymore because the response object is of type DefaultDataResponse not HTTPResponse...
In order to access the data/image you need to go with response.response. depending on what you want to access:
response.response?.value(forKey: "")
Check the other method calls and properties. I believe you will find the data you are looking for.
I just converted my app to Swift 2, and of course, am getting one error message:
"Call can throw, but it is not marked with 'try' and the eror is not handled"
I did search here for how to fix this, but the answers are even more confusing to me than the error itself. LOL.
My application worked perfectly until I converted it into Swift 2. Wonderful...
var myPlayer = AVAudioPlayer()
var yourSound1 = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("RemSound_01", ofType: "wav")!)
func initYourSound() {
myPlayer = AVAudioPlayer(contentsOfURL: yourSound1, fileTypeHint: nil)
myPlayer.prepareToPlay()
myPlayer.volume = 1.0 // < for setting initial volume, still not perfected.
}
The error throws in the following line:
myPlayer = AVAudioPlayer(contentsOfURL: yourSound1, fileTypeHint: nil)
How am I supposed to fix this? I understand that Swift is trying to "universalize" error handling, but doing so by breaking even the simplest of code seems silly to me.
Thank you for your help.
Here is the pattern you are looking for.
<throwing function> // compiler error in Swift 2
do { try <throwing function> } catch { }
In catch you usually get an error that you can handle further.
This works in Swift 2.0, put it in your viewDidLoad method ...
do {
try AudioPlayer = AVAudioPlayer(contentsOfURL: ButtonAudioURL, fileTypeHint: nil)
} catch {
print("errorin do-try-catch")
}
where ButtonAudioURL is
var ButtonAudioURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Besides", ofType: "mp3")!)
Not sure what I'm doing wrong. I'm using this module https://github.com/wenzhaot/InstagramPhotoPicker (the header file for the block is here https://github.com/wenzhaot/InstagramPhotoPicker/blob/master/TWPhotoPicker/TWPhotoPickerController.h)
In Objective-C, the syntax is:
photoPicker.cropBlock = ^(UIImage *image) {
//do something
};
I tried converting it to swift, but I'm getting an error
photoPicker.cropBlock{ (image:UIImage) -> () in
//Do something
//error: cannot invoke 'cropBlock' with an argument list of type '((UIImage) -> ())'
}
How to get it to work?
You're just missing = sign. Also image is implicitly unwrapped optional:
photoPicker.cropBlock = { (image: UIImage!) -> () in
//Do something
}
or
photoPicker.cropBlock = { image in
//Do something
}
I'm trying to convert and existing, working objective c application over to swift and I'm getting a little tripped up with "closures". Here's the old working objective c block that makes returns a value from a web service:
- (IBAction)didTapSayHiButton {
[self.meteor callMethodName:#"sayHelloTo" parameters:#[self.username.text] responseCallback:^(NSDictionary *response, NSError *error) {
NSString *message = response[#"result"];
[[[UIAlertView alloc] initWithTitle:#"Meteor Todos" message:message delegate:nil cancelButtonTitle:#"Great" otherButtonTitles:nil] show];
}];
}
So here I'm getting either getting back a dictionary or response. And it works.
And here's how I'm trying to go about this with swift (the method is slightly different):
#IBAction func sayHi(sender : AnyObject) {
var params = [
"name": "Scotty"
]
meteor.callMethodName("sayHi", parameters: params, responseCallback: {
(response: Dictionary<String, String>, error: NSError) in
println("the name recieved back is: \(response)")
})
}
The error I'm getting in xCode: "NSDictionary is not a subtype of 'Dictionary'"
After looking through the swift book this is the best educated attempt that I can make. I've tried a few other things but each resulted in another type of error.
How do I make this work with swift?
Edit: I've also tried just using Dictionary and Dictionary<String, String>
I should also note that I'm using a bridging header to access objective c code (objectiveDDP). And that callMethodNamed is written in objective c as can be seen here: https://github.com/boundsj/ObjectiveDDP/blob/master/ObjectiveDDP/MeteorClient.h#L47
Update: by changing the method to:
meteor.callMethodName("sayHi", parameters:["scotty"] , responseCallback:nil)
we were able to get it to work. But the second we try to add in the closure, it starts throwing the same original errors.
Try changing from using a Swift dictionary to explicitly using NSDictionary:
#IBAction func sayHi(sender : AnyObject) {
var params: NSDictionary = [
"name": "Scotty"
]
meteor.callMethodName("sayHi", parameters: params, responseCallback: {
(response: NSDictionary!, error: NSError) in
println("the name recieved back is: \(response)")
})
}
The trick, in this particular case, is to completely omit the closure's parameter types, and let the compiler figure it out. After searching around for a while, I found this post which led me to the solution.
meteor.callMethodName("sayHi", parameters:["scotty"] , responseCallback: {
response, error in
let me:String = response["result"] as String!
println("called back \(me)")
})
If your not worried about accessing the closures parameters, apparently you can also using an underscore to ignore them completely:
meteor.callMethodName("sayHi", parameters:["scotty"] , responseCallback: {
_ in
// Do something here
})